Messages in this thread Patch in this message | | | From | Zhen Lei <> | Subject | [PATCH v2] arm64: add the printing of tpidr_elx in __show_regs() | Date | Wed, 16 Mar 2022 14:24:08 +0800 |
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Commit 7158627686f0 ("arm64: percpu: implement optimised pcpu access using tpidr_el1") and commit 6d99b68933fb ("arm64: alternatives: use tpidr_el2 on VHE hosts") use tpidr_elx to cache my_cpu_offset to optimize pcpu access. However, when performing reverse execution based on the registers and the memory contents in kdump, this information is sometimes required if there is a pcpu access.
Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com> --- arch/arm64/kernel/process.c | 11 +++++++++++ 1 file changed, 11 insertions(+)
v1 --> v2: Directly print the tpidr_elx register of the current exception level. Avoid coupling with the implementation of 'my_cpu_offset'.
diff --git a/arch/arm64/kernel/process.c b/arch/arm64/kernel/process.c index 5369e649fa79ff8..738932e6fa4e947 100644 --- a/arch/arm64/kernel/process.c +++ b/arch/arm64/kernel/process.c @@ -216,6 +216,17 @@ void __show_regs(struct pt_regs *regs) show_regs_print_info(KERN_DEFAULT); print_pstate(regs); + switch (read_sysreg(CurrentEL)) { + case CurrentEL_EL1: + printk("tpidr_el1 : %016llx\n", read_sysreg(TPIDR_EL1)); + break; + case CurrentEL_EL2: + printk("tpidr_el2 : %016llx\n", read_sysreg(TPIDR_EL2)); + break; + default: + break; + } + if (!user_mode(regs)) { printk("pc : %pS\n", (void *)regs->pc); printk("lr : %pS\n", (void *)ptrauth_strip_insn_pac(lr)); -- 2.25.1
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